Yield enhancing agent for harvesting part of crop

Abstract

A means for enhancing the yield of a harvesting part of a crop is provided. A yield enhancing agent for a harvesting part selected from the group consisting of seed, fruit, hypocotyl, root and stem in a crop, the yield enhancing agent comprising: 5-aminolevulic acid or a derivative thereof represented by the following formula (1), or a salt thereof; and a gibberellin biosynthesis inhibitor: R 2 R 1 NCH 2 COCH 2 CH 2 COR 3 (1), wherein R 1 and R 2 each independently represent a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group or an aralkyl group; and R 3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group or an amino group, wherein the yield enhancing agent is an agent to be applied at the time when the harvesting part of the crop becomes enlarged.

What is claimed is: 
     
       1. A method for enhancing a yield of a seed of a crop to be harvested, wherein the crop to be harvested is a Gramineae or a Compositae, wherein the method comprises applying 5-aminolevulic acid or a salt thereof and at least one gibberellin biosynthesis inhibitor selected from the group consisting of uniconazole P, prohexadione calcium salt, and salts or isomers thereof fourteen days before and after flowering or ear emergence or from three days before enlargement of the part of the crop to be harvested to completion of the enlargement,
 wherein the amount of gibberellin biosynthesis inhibitor is present in an amount of 10 to 5000 parts by weight with respect to 100 parts by weight of 5-aminolevulinic acid or a salt of the acid. 
 
     
     
       2. The method for enhancing a yield according to  claim 1 , wherein the 5-aminolevulinic acid or a salt thereof and the gibberellin biosynthesis inhibitor are applied simultaneously. 
     
     
       3. The yield enhancing combination according to  claim 1 , wherein the crop of Gramineae, or Compositae is rice, barley or sunflower.